Incomplete immunity to backscattering in chiral one-way photonic crystals

Pi Ju Cheng, Chung-Hao Tien, Shu Wei Chang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We show that the propagating modes in a strongly-guided chiral one-way photonic crystal are not backscattering-immune even though they are indeed insensitive to many kinds of scatters. Since these modes are not protected by the nonreciprocity, the backscattering does occur under certain circumstances. We use a perturbative method to derive criteria for the prominent backscattering in such chiral structures. From both our theory and numerical examinations, we find that the amount of backscattering critically depends on the symmetry of scatters. Additionally, for these chiral photonic modes, disturbances at the most intense parts of field profiles do not necessarily lead to the most effective backscattering.

Original languageEnglish
Pages (from-to)10327-10340
Number of pages14
JournalOptics Express
Issue number8
StatePublished - 1 Jan 2015

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